天地波组网雷达同步控制系统设计

Synchronous Control System Design of Hybrid Sky-Surface Wave Radar Network

天地波组网高频地波雷达采用天波发射、地波接收和地波发射、地波接收的形式实现对海洋表面动力学参数如海洋表面流场、风场等的监测,具有覆盖面积广、回波蕴含信息丰富等特点。由于采用收发分置模式,这种组网雷达需要解决接收站与发射站、以及多个接收站之间的同步问题,主要有时间、频率和相位三大同步。针对探测海洋动力学参数的要求,分析了天地波组网雷达对同步的需求,提出了同步控制系统的设计方案,包括基于授时GPS实现的系统外同步设计以及基于FPGA实现的系统内同步设计,并给出了相应的硬件和软件实现以及闭环和外场测试结果。该方案解决了天地波组网同步问题,海边进行的天地波组网现场实验也证明了该方案的正确性。

High frequency hybrid sky-surface wave radar network is designed to extract sea surface state parameters such as sea current and wind speed.It works by transmitting both sky wave and ground wave then receiving ground waves,so this radar network has the feature of wide coved area,abundant backward wave information and so on.Since the transmitting stations and the receiving stations are separated,there needs a perfect synchronization system between the separated receivers and transmitters,as well as among multiple receiving stations,which involves time synchronization,frequency synchronization and phase syn-chronization.In order to satisfy the requirement of the radar network,a scheme of synchronous control system is presented which includes external synchronization sub-system based on GPS and internal synchroniza-tion sub-system based on FPGA.The scheme solves the problem of synchronization for hybrid sky-surface wave radar.The experimental results prove the validity of the proposed scheme.